{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["concept or principle", "machanical property", "manufacturing standard", "machine or equipment", "manufacturing process", "enabling technology"], "input": "In L-PBF and at macro level , the top surfaces of the round holes have the tendency to sag or collapse , and the cross section of the channel has to be optimized ."}
{"concept or principle": ["surfaces", "cross section"], "machanical property": [], "manufacturing standard": [], "machine or equipment": [], "manufacturing process": ["L-PBF"], "enabling technology": []}